Globe for lighting-fixtures



F. W. MATHIEU.

GLOBE FOR LiGHTlNG FIXTURES.

APPLICATION HLED JUNE23. i919.

Patenmd apt. 28, 1920.

UITED STATES rnananrcx w. MATEIEU, or new relax, a. r..-

erlcnn roza LIGHTING-FIXTURES.

Specification of Letters Patent.

Patented Sept. 28, 19200 Application filed June 28, 1213. Serial K0.306,051.

To all whom it may concern:

Be it known that I, Fnsnnnron: W. MA'rnnzU, a citizen of the UnitedStates, and

- a resident of the cit of New York, county and State of New ork, haveinvented an Improvement in Globes for Lighting-FIX- tures, of which thefollowing is a specification.

My invention relates to lighting fixtures, an object thereof being toprovide a novel and highly desirable form of globe for such fixtures anda superior type of fixture in which said globe may be incorporated.

have shown an illustrative embodiment of my invention in theaccompanying drawin' s, wherein:

igure 1 is a cross section of said embodi ment;

l 1g. 2 is a diagrammatic view illustrating the distribution of light inthe foregoing embodiment.

he foregoing illustrative embodiment of my invention comprises aglobe Acontaining a source of light such as the incandescentbulb ll, the wholebeing supported by a supmrtin mcmber 'enerall desi nated b refls -2 screncc character C.

The fixture may also be provided with an ornamental member such as atassel l) which also serves to assist in ventilating the globe as willbe subsequently more fully set forth.

The globe, which is preferably made integral and oi translucentmaterial, as by blowing the same of a single piccc'of opal glass, comprises an outer frusto-coriical reflecting and diffusing member 1. Atone end. preferably theupper or small end of the outer member, is anannular reflecting and dili'usmg member 2, preferablyroar-ave, so as toassist in distributing the light in the manner desired.

At the other end of an inwardly extending ing member 3. Said membercomprises a central conyex diiiusing and reflecting portion 4 and aperipheral frust-o-conical diffusing portion 5. Thecentheouter member isdiffusing and reflectadjacent the apex oi" the frustum of a cone comrising the member 5.

The member D is channeled as at 7 and passes through an aperture 8 inthe member 4, where it 11s held by means of the nut 9 e06 crating witthe threaded inner end 10 of libe member and I inwardly extending Thefixture is sup cited by means of the member C which ts over thechanneled open upper end 11 of the globe A, the usual binding screwsbeing" provided to enter the channel 12 to fixedly position the fixturewith respect to its support. The support C is perforated as indicated at13, the perforations being covered by a guard member 14 which serves toprevent any midesirable light from issuing through 13. ring or othermember may be rovided for sup orting the fixture as a whole. In Fi 2, lhave diagrammatically illustrated t e approximate disposition of thelight rays in the embodiment above described. A certain component of thelight will pass directly through the members 1, 2 and 4. ue-toithcdisposi'tion of the light with respect to the'member 5, no light willdirectly pass through this member which is one of the desirable featuresof the foregoing embodiment of my invention. Light will, however, passthrough said member 5 byreflection directly from members 1 and 2 andalso by double reflection from member 5 being softly illmninated,whereas the member 4 will be very brightly illuminated, while themembers 1 and 2 will be illuminated with a brightness intermediate thatof members and 5.

Since member 3, comprising portions 4 '3, extends inwardly, member 4which is most brightly illuminated will not ordinarily be directlyvisible, especially where the fixture is used for av dining room lampfor illuminating a table by being suspended only a short distance abovethe table. the other hand. member 1 which is model ately illuminated andmember 5 is softly illuminated, will be directly visible,

but being moderately illuminated will be free from glare and the fixtureas a whole will present a very softly lighted, attractive appearancewhile utilizing very eificiently and economically distributing the lightvalues of the source of light.

It is of course, to be understood that my poses of illustration only.What I claim is:

'1. A globe for lighting fixtures having an outer, frusto-conicalreflecting and diifusin member, a substantially horizontal reflectingand diffusing member at one .endcf said the perforations e vex entermember,

and an, inwardly extending diifusing and reflectin 'member at the otherend of said outer mem er, said inwardly extending member comprising acentral conrtion.

lobe for lighting fixtures havin an outer, s ightly inclinedfrusto-conical re ectihg and diffusing member, an annular, substantiallyhorizontal convex reflecting and diffusing member atone end of saidouter member, and an inwardly extending diffusing and reflecting memberat the other end outer member,

fixtures having an outer,

of said outer member, said inwardly extendmg member comprisin a centralconvex portion and a periphera frusto-conical portion.

ing fixtures havin re ecting and di using member, a reflectin r anddiffusing member at one end of said and an inwardly extending diffusingand refiectin member at the other end of said outer member, saidinwardly extending member vex portion'and rt1on.-

4. A unitary,

a peripheral frusto-conical translucent globe for lightfru'sto-comcal reecting and'diflusing member, an annular, convex reflecting and diffusingmember at one end of said outer member and an indiffusing and reflectinmember at the other 1 end of said outer mem r, said inwardly ex-"prising acentral wardly extending diiiusing' and reflecting member atthe other end of said outer member, said inwardly extending'membercomconvex portion and a peripheral frusto-conical portion. 4

5. A globe for lighting fixtures having an outer, frusto-conicalreflecting and diffusing member,-a substantially horizontal reflectinand diffusing member at one end 5 outer member, and an inwardlyextending tending member comprising a centrai conrtion and a perlpheralfrusto-conical,

3. A unitary, translucent globe for lightan outer, 'frusto-conical'comprising a central con-- ,wardly member at the other-end of said outermem-.

vex portion and a peripheral frusto-conical portion, in combination witha source of light adjacent the apex of said peripheral I frusto-conicalportion.

6. A globe for'lighting fixtures having an outer, frusto-conicalreflecting and diffusing member, an annular, substantially horizontalconvex reflecting and difl'using-me'mber at one end of said outermember, and amintending member comprising a central convex portion and aperipheral frusto-conical portion, in combination with a source of lightadjacent the apex of said peripheral frustoconical portion.

8. A unitary, translucent globe for lightin fixtures having an outer,frusto-conical re ecting and diffusing member, an annular convexvreflecting and diffusing member at one end of said outer member and aninextending diffusing and reflecting her, said inwardly extending membercomprising ripheral frusto-conical tion with a soul'ce of lig of saidperipheral frusto-conical portion.

In testimony whereof, I have signed my name to this specification this20th day of June, 1919.

FREDERICK w. 'MA'rmEU.

a central convex portion and a peortion, in combinat adjacent the apex

